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细节
cover 1857 (22 Sept.) entire (light creases) to Cape Town, marked "Via Aden & Point de Galle", bearing 2a. green marginal pair with good margins, clearly cancelled "B/172", showing "PACKET LETTER/MAURITIUS" double-line oval d.s. and, on reverse, "SINGAPORE/P.O." and arrival datestamps, both in red. A most unusual destination. Photo